Dynabrade 78597 3/8" Dia. x 1-1/2" W x 1/8" Center Hole, 180 Grit, 100/pack 
Insize 4168-11E, STEEL STANDARD BALLS, 13/32″, 6940561981490
$16.90
To measure angle and diameter of taper holes
Material: tool steel
Hardness: HRC63
Diameter accuracy:?.00012?
Roundness .00004″
Supplied with manufacturer inspection certificate.
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